#include<stdio.h>
#include<assert.h>
char* css(char* a,char* b)
{
	char* c=a;
	assert((a && b)!=NULL);
	while(*a++ = *b++)
	{
		;
	}
	return c;
} 
int main()
{
	char b[]="ADGSDG";
	char a[100];
	css(a,b);
	printf("%s\n",a);
	printf("%s",css(a,b));
	return 0;
}
